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(#) Application vulnerable to DNS spoofing attacks

!!! WARNING: Application vulnerable to DNS spoofing attacks
   This is a warning.

Id
:   `InsecureDnsSdkLevel`
Summary
:   Application vulnerable to DNS spoofing attacks
Severity
:   Warning
Category
:   Security
Platform
:   Android
Vendor
:   Google - Android 3P Vulnerability Research
Contact
:   https://github.com/google/android-security-lints
Feedback
:   https://github.com/google/android-security-lints/issues
Min
:   Lint 4.1
Compiled
:   Lint 8.0 and 8.1
Artifact
:   [com.android.security.lint:lint](com_android_security_lint_lint.md.html)
Since
:   1.0.1
Affects
:   Manifest files
Editing
:   This check runs on the fly in the IDE editor
See
:   https://goo.gle/InsecureDnsSdkLevel
Implementation
:   [Source Code](https://github.com/google/android-security-lints/tree/main/checks/src/main/java/com/example/lint/checks/DnsConfigDetector.kt)
Tests
:   [Source Code](https://github.com/google/android-security-lints/tree/main/checks/src/test/java/com/example/lint/checks/DnsConfigDetectorTest.kt)
Copyright Year
:   2024

Apps targeting SDK versions earlier than 28 are susceptible to DNS
attacks like DNS spoofing or cache poisoning.

!!! Tip
   This lint check has an associated quickfix available in the IDE.

(##) Example

Here is an example of lint warnings produced by this check:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~text
AndroidManifest.xml:2:Warning: Update your application's target SDK
version to 28 and above to make use of the Android OS's built-in
transport security features [InsecureDnsSdkLevel]
&lt;uses-sdk android:targetSdkVersion='27'/&gt;
                                    --
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Here is the source file referenced above:

`AndroidManifest.xml`:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~xml linenumbers
&lt;manifest xmlns:android='http://schemas.android.com/apk/res/android' package='test.pkg'&gt;
&lt;uses-sdk android:targetSdkVersion='27'/&gt;
&lt;application android:debuggable='false'&gt;
    &lt;activity android:name='com.example.MainActivity'&gt;&lt;/activity&gt;
&lt;/application&gt;
&lt;/manifest&gt;
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

You can also visit the
[source code](https://github.com/google/android-security-lints/tree/main/checks/src/test/java/com/example/lint/checks/DnsConfigDetectorTest.kt)
for the unit tests for this check to see additional scenarios.

The above example was automatically extracted from the first unit test
found for this lint check, `DnsConfigDetector.testWhenTargetSdkBelowSecureDnsTransportPatch_showsWarning`.
To report a problem with this extracted sample, visit
https://github.com/google/android-security-lints/issues.

(##) Including

!!!
   This is not a built-in check. To include it, add the below dependency
   to your project. This lint check is included in the lint documentation,
   but the Android team may or may not agree with its recommendations.

```
// build.gradle.kts
lintChecks("com.android.security.lint:lint:1.0.3")

// build.gradle
lintChecks 'com.android.security.lint:lint:1.0.3'

// build.gradle.kts with version catalogs:
lintChecks(libs.com.android.security.lint.lint)

# libs.versions.toml
[versions]
com-android-security-lint-lint = "1.0.3"
[libraries]
# For clarity and text wrapping purposes the following declaration is
# shown split up across lines, but in TOML it needs to be on a single
# line (see https://github.com/toml-lang/toml/issues/516) so adjust
# when pasting into libs.versions.toml:
com-android-security-lint-lint = {
    module = "com.android.security.lint:lint",
    version.ref = "com-android-security-lint-lint"
}
```

1.0.3 is the version this documentation was generated from;
there may be newer versions available.

[Additional details about com.android.security.lint:lint](com_android_security_lint_lint.md.html).
(##) Suppressing

You can suppress false positives using one of the following mechanisms:

* Adding the suppression attribute
  `tools:ignore="InsecureDnsSdkLevel"` on the problematic XML element
  (or one of its enclosing elements). You may also need to add the
  following namespace declaration on the root element in the XML file
  if it's not already there:
  `xmlns:tools="http://schemas.android.com/tools"`.

  ```xml
  &lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;manifest xmlns:tools="http://schemas.android.com/tools"&gt;
      ...
      &lt;uses-sdk tools:ignore="InsecureDnsSdkLevel" .../&gt;
    ...
  &lt;/manifest&gt;
  ```

* Using a special `lint.xml` file in the source tree which turns off
  the check in that folder and any sub folder. A simple file might look
  like this:
  ```xml
  &lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;lint&gt;
      &lt;issue id="InsecureDnsSdkLevel" severity="ignore" /&gt;
  &lt;/lint&gt;
  ```
  Instead of `ignore` you can also change the severity here, for
  example from `error` to `warning`. You can find additional
  documentation on how to filter issues by path, regular expression and
  so on
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/lintxml.md.html).

* In Gradle projects, using the DSL syntax to configure lint. For
  example, you can use something like
  ```gradle
  lintOptions {
      disable 'InsecureDnsSdkLevel'
  }
  ```
  In Android projects this should be nested inside an `android { }`
  block.

* For manual invocations of `lint`, using the `--ignore` flag:
  ```
  $ lint --ignore InsecureDnsSdkLevel ...`
  ```

* Last, but not least, using baselines, as discussed
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/baselines.md.html).

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